CN104823502A - Base station, user equipment and method for TCP transmission with dynamic TDD reconfiguration - Google Patents

Base station, user equipment and method for TCP transmission with dynamic TDD reconfiguration Download PDF

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Publication number
CN104823502A
CN104823502A CN201280077336.7A CN201280077336A CN104823502A CN 104823502 A CN104823502 A CN 104823502A CN 201280077336 A CN201280077336 A CN 201280077336A CN 104823502 A CN104823502 A CN 104823502A
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tcp
tdd
transmit leg
transmission
reconfiguration time
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CN201280077336.7A
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CN104823502B (en
Inventor
范锐
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Ericsson China Communications Co Ltd
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Ericsson China Communications Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/50—Queue scheduling
    • H04L47/56—Queue scheduling implementing delay-aware scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/26—Flow control; Congestion control using explicit feedback to the source, e.g. choke packets
    • H04L47/266—Stopping or restarting the source, e.g. X-on or X-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/19—Flow control; Congestion control at layers above the network layer
    • H04L47/193—Flow control; Congestion control at layers above the network layer at the transport layer, e.g. TCP related
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/28—Flow control; Congestion control in relation to timing considerations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/28—Flow control; Congestion control in relation to timing considerations
    • H04L47/283—Flow control; Congestion control in relation to timing considerations in response to processing delays, e.g. caused by jitter or round trip time [RTT]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/32—Flow control; Congestion control by discarding or delaying data units, e.g. packets or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0273—Traffic management, e.g. flow control or congestion control adapting protocols for flow control or congestion control to wireless environment, e.g. adapting transmission control protocol [TCP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1848—Time-out mechanisms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1874—Buffer management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/06—Transport layer protocols, e.g. TCP [Transport Control Protocol] over wireless
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices
    • H04W88/182—Network node acting on behalf of an other network entity, e.g. proxy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The present disclosure provides a method for forwarding to a Transport Control Protocol (TCP) receiver a TCP transmission sent from a TCP sender. The method includes: determining Time Division Duplex (TDD) reconfiguration time required for a TDD reconfiguration; comparing the TDD reconfiguration time with a predetermined threshold; suspending the forwarding of the TCP transmission to the TCP receiver during the TDD reconfiguration time if the TDD reconfiguration time is larger than the predetermined threshold; and resuming the suspended forwarding of the TCP transmission after the TDD reconfiguration time has lapsed. The present disclosure also provides a method for transmitting a TCP transmission to a TCP receiver, a base station and a user equipment.

Description

For having the base station of the TCP transmission that dynamic TDD reshuffles, subscriber equipment and method
Technical field
The present invention relates to the communication technology, more specifically, relating to base station that the transmission control protocol (TCP) of reshuffling for having dynamic Time Division duplex (TDD) transmits, subscriber equipment and method.
Background technology
Current in third generation partnership projects (3GPP), in Long Term Evolution (LTE) system, introduced the feature that dynamic Time Division duplex (TDD) is reshuffled.That is, the TDD configuration in community is not fixed, but can require according to practical business and change.Such as, if need more business in down link (DL), more subframe can be distributed for DL.On the other hand, if need more business in up link (UL), more subframe can be distributed for UL.Although dynamically TDD reshuffles and is applicable to meet business demand, but be problematic concerning transmission control protocol (TCP) transmission, because need the time to switch TDD configuration, especially for their nextport hardware component NextPort at base station (such as enode b (eNB)) and subscriber equipment (UE) place.If one in base station and UE has completed that TDD reshuffles and another does not have, then thus may exist useless has also been the transmission of unnecessary TCP grouping, causes power dissipation, and power is concerning extremely important UE.
In addition, if this TDD reconfiguration time can compare with TCP two-way time, then the performance of TCP transmission may significantly decline, because base station and UE cannot reshuffle period successfully transmission or reception data at TDD, thus corresponding packet loss rate will be very high.Specifically, cause packet loss or delayed response because TDD reshuffles, the overtime timer of TCP transmit leg may expire.In this case, due to the congestion control mechanism according to Transmission Control Protocol, the congestion window at TCP transmit leg place will drop to 1, and owing to being such as called the mechanism of " slow turn-on ", TDD reshuffles the recovery of rear TCP transmission will slowly.
Summary of the invention
The object of the invention is to overcome at least one in the above shortcoming of prior art.
For realizing this object, according to an aspect of the present invention, a kind of method for forwarding the TCP transmission sent from TCP transmit leg to transmission control protocol (TCP) recipient is provided.Described method comprises: determine that time division duplex (TDD) reshuffles required TDD reconfiguration time; TDD reconfiguration time and predetermined threshold are compared; If TDD reconfiguration time is greater than predetermined threshold, then suspends during TDD reconfiguration time and forward TCP transmission to TCP recipient; And after TDD reconfiguration time, recover the forwarding of the TCP transmission suspended.
According to another aspect of the present invention, a kind of base station for forwarding the TCP transmission sent from TCP transmit leg to transmission control protocol (TCP) recipient is provided.Described base station comprises: determining unit, is suitable for determining that time division duplex (TDD) reshuffles required TDD reconfiguration time; Comparing unit, is suitable for TDD reconfiguration time and predetermined threshold to compare; Suspend unit, if be suitable for described comparing unit to determine that TDD reconfiguration time is greater than predetermined threshold, then suspend during TDD reconfiguration time and forward TCP transmission to TCP recipient; And recovery unit, be suitable for after TDD reconfiguration time, recover the forwarding of the TCP transmission suspended.
According to another aspect of the present invention, one is provided for sending the method for TCP transmission to transmission control protocol (TCP) recipient.Described method comprises: obtain time division duplex (TDD) and reshuffle required TDD reconfiguration time; If TDD reconfiguration time is greater than predetermined threshold, then suspends during TDD reconfiguration time and send TCP grouping to TCP recipient; And after TDD reconfiguration time, recover the transmission of the TCP grouping suspended.
According to another aspect of the present invention, one is provided for sending the subscriber equipment of TCP transmission to transmission control protocol (TCP) recipient.Described subscriber equipment comprises: obtain unit, is suitable for obtaining time division duplex (TDD) and reshuffles required TDD reconfiguration time; Suspend unit, if be suitable for TDD reconfiguration time to be greater than predetermined threshold, then suspend during TDD reconfiguration time and send TCP grouping to TCP recipient; And recovery unit, be suitable for after TDD reconfiguration time, recover the transmission of the TCP grouping suspended.
Utilize embodiments of the invention, when TDD reconfiguration time is greater than predetermined threshold, TCP transmission can be suspended during TDD reconfiguration time, the transmission of TCP grouping unnecessary during making it possible to avoid TDD reconfiguration time, thus the power consumption at base station and/or UE place can be reduced.
Accompanying drawing explanation
By the description of the embodiment below with reference to accompanying drawing, above and other objects, feature and advantage will be more clear, wherein:
Fig. 1 is the block diagram according to base station of the present invention;
Fig. 2 is the block diagram according to subscriber equipment of the present invention (UE);
Fig. 3 is the sequence chart according to the present invention first example;
Fig. 4 is the sequence chart according to the present invention second example;
Fig. 5 is the sequence chart according to the present invention the 3rd example;
Fig. 6 is the sequence chart according to the present invention the 4th example;
Fig. 7 is the sequence chart according to the present invention the 5th example;
Fig. 8 is the sequence chart according to the present invention the 6th example;
Fig. 9 is according to the embodiment of the present invention, for forwarding the flow chart of the method for TCP transmission; And
Figure 10 is according to the embodiment of the present invention, for sending the flow chart of the method for TCP transmission.
Embodiment
Below with reference to accompanying drawing, describe embodiments of the invention in detail.It should be noted that following examples are only illustrative, do not limit the scope of the invention.
Fig. 1 is the block diagram of the base station 100 according to the embodiment of the present invention.In the present context, base station 100 can be realize the eNB that TDD in LTE system reshuffles feature.According to the present invention, base station 100 forwards the TCP transmission sent from TCP transmit leg to TCP recipient.TCP transmit leg can be server, UE or other suitable nodes sending TCP grouping to TCP recipient arbitrarily.In embodiment, TCP recipient is the subscriber equipment (UE) that base station 100 is served.As shown in Figure 1, base station 100 comprises determining unit 110, comparing unit 120, suspends unit 130 and recovery unit 140.
Determining unit 110 is configured to determine that TDD reshuffles required TDD reconfiguration time." TDD reconfiguration time " used herein refers to that both base station and UE complete TDD and reshuffle the required time period, and can estimate based on the ability of base station and UE.Such as, determining unit 110 can determine that base station 100 performs TDD and reshuffles the required time, t1, and from UE obtain UE perform TDD reshuffle the required time, t2.Then, determining unit 110 can determine that TDD reconfiguration time is max (t1, t2).
Comparing unit 120 is configured to the TDD reconfiguration time determined by determining unit 100 and predetermined threshold to compare.As non-limiting example, be the TCP transmission of hundreds of millisecond magnitude for timeout value on the Internet, predetermined threshold can be set to 100ms.
Suspend unit 130 to be configured to, if the comparison instruction TDD reconfiguration time that comparing unit 120 carries out is greater than predetermined threshold, then suspends during TDD reconfiguration time and forward TCP transmission to TCP recipient.
Recovery unit 140 is configured to, and after TDD reconfiguration time, recovers the forwarding suspending the TCP transmission that unit 130 suspends.
According to embodiment, base station 100 also comprises delay cell (not shown).Delay cell is configured to: before TDD reshuffles, by the time period of the forward delay of TCP transmission according to TDD reconfiguration time, the maturity value of the TCP overtime timer at TCP transmit leg place is increased to can not make timer because of time-out overdue value.As non-limiting example, if TDD reconfiguration time thus to suspend duration be 200ms, then base station can by the TCP packetization delay 20ms of first in TCP transmission, and second TCP grouping postpones another 20ms again, 3rd TCP grouping postpones another 20ms again, by that analogy.The delay introduced in a base station can not make TCP overtime timer expire, because the latter is the magnitude of hundreds of millisecond.After postponing 10 TCP groupings in this way, the maturity value of the TCP overtime timer at TCP transmit leg place can increase at least 200ms, and timer can not be expired because of follow-up time-out.
According to embodiment, base station 100 also comprises response transmitting element (not shown).Response transmitting element is configured to: before TDD reshuffles, and sends TCP response (ACK) grouping to TCP transmit leg, to forbid that TCP transmit leg sends any more TCP groupings.Here, a TCP ACK grouping can have the receive window field of null value.Response transmitting element is also configured to: after TDD reconfiguration time, sends the 2nd TCPACK grouping to TCP transmit leg, sends any more TCP groupings to allow TCP transmit leg.Here, the 2nd TCP ACK grouping can have the receive window field of nonzero value.
According to another embodiment, TCP transmission comprises from TCP transmit leg to first TCP transmission of agency with from agency to second TCP transmission of TCP recipient.Base station 100 can also comprise indicating member (not shown).Indicating member is configured to: before TDD reshuffles, and instruction agency sends TCP response (ACK) grouping to TCP transmit leg, to forbid that TCP transmit leg sends any more TCP groupings.Indicating member is also configured to: after TDD reconfiguration time, and instruction agency sends the 2nd TCP ACK to TCP transmit leg and divides into groups, and sends any more TCP groupings to allow TCP transmit leg.Again, a TCP ACK can have the receive window field of null value, and the 2nd TCP ACK grouping can have the receive window field of nonzero value.Here, agency can between TCP transmit leg and base station.
Fig. 2 is the block diagram of the subscriber equipment (UE) 200 according to the embodiment of the present invention.According to the present invention, UE 200 sends transmission control protocol (TCP) transmission via base station to TCP recipient.As shown in Figure 2, UE 200 comprises acquisition unit 210, suspends unit 220 and recovery unit 230.
Acquisition unit 210 is configured to obtain TDD and reshuffles required TDD reconfiguration time.Such as, acquisition unit 210 can obtain base station execution TDD and reshuffle the required time, t1 from base station, and determines that UE 200 performs TDD and reshuffles the required time, t2.Then, obtain unit 210 and can determine that TDD reconfiguration time is max (t1, t2).Alternatively, UE 200 can determine TDD reconfiguration time to allow the determining unit 110 of base station by informing base station time t2, then obtains TDD reconfiguration time from base station.
Suspend unit 220 to be configured to, if TDD reconfiguration time is greater than predetermined threshold, then suspends during the TDD reconfiguration time obtaining unit 210 acquisition and send TCP grouping to TCP recipient.
Recovery unit 230 is configured to, and after TDD reconfiguration time, recovers the transmission suspending the TCP grouping that unit 220 suspends.
In embodiment, UE 200 also comprises comparing unit (not shown).Comparing unit is configured to, and TDD reconfiguration time and predetermined threshold is compared, to determine whether TDD reconfiguration time is greater than predetermined threshold.
In embodiment, UE 200 also comprises delay cell (not shown).Delay cell is configured to: before TDD reshuffles, transmission lag TCP divided into groups at the layer lower than TCP layer according to the time period of TDD reconfiguration time, the maturity value of the TCP overtime timer at UE (i.e. TCP transmit leg) place is increased to can not make timer because of time-out overdue value.As non-limiting example, when receiving TCP grouping, PDCP (PDCP) layer does not send this grouping to wireless spread-spectrum technology (RLC) layer immediately, but by this buffering of packets a period of time, is then sent to rlc layer.In a non-limiting example, if TDD reconfiguration time thus to suspend duration be 200ms, then lower level can by the TCP packetization delay 20ms of first in TCP transmission, and second TCP grouping postpones another 20ms again, 3rd TCP grouping postpones another 20ms again, by that analogy.Originally the delay being in introducing at lower level can not make TCP overtime timer expire, because the latter is the magnitude of hundreds of millisecond.After postponing 10 TCP groupings in this way, the maturity value of the TCP overtime timer at TCP layer place can increase at least 200ms, and timer can not be expired because of follow-up time-out.
Below with reference to the example shown in Fig. 3 to 8, function and the operation of each assembly of base station 100 and UE 200 is described in further detail.It should be noted that and the invention is not restricted to following example.
first example
Fig. 3 is the sequence chart according to the present invention first example.In this illustration, base station forwards to TCP recipient's (being the UE of base station service in this situation) TCP transmission sent from TCP transmit leg.As shown in Figure 3, in step 300, TCP transmission well afoot.Base station determines that performing TDD reshuffles.
In step 302, base station obtains UE execution TDD from UE and reshuffles the required time, t2.The determining unit 110 of base station can determine that base station performs TDD and reshuffles the required time, t1, and determines that TDD reconfiguration time is max (t1, t2).Then, the TDD reconfiguration time determined by determining unit 110 and predetermined threshold compare by the comparing unit 120 of base station.Alternatively, can perform when the initial access base station of UE and determine and compare.
If the comparison instruction TDD reconfiguration time of comparing unit 120 is greater than predetermined threshold, then in step 304, the delay cell of base station is by the time period of the forward delay of TCP transmission according to TDD reconfiguration time.Such as, base station can be detected (DPI) by such as deep packet and detect TCP grouping.
Here, each TCP grouping is delayed by as making before the TCP overtime timer at TCP transmit leg place expires, and TCP transmit leg can receive the TCP ACK dividing into groups corresponding with the TCP postponed and divide into groups.That is, owing to postponing, TCP increases two-way time, but does not increase to and cause TCP overtime timer to expire.
Correspondingly, because TCP increases two-way time, the maturity value of the TCP overtime timer at TCP transmit leg place increases (step 306).Here, time of delay, section was configured to, the maturity value of the TCP overtime timer of TCP transmit leg is increased to can not make timer because of the time-out (describing after a while) of the TCP transmission during follow-up TDD time reconf iotagurator overdue value.
Then, in step 308, the time-out unit 130 of base station suspends and forwards TCP transmission to TCP recipient.In step 310, all perform TDD in base station and UE place and reshuffle.At interval, namely during TDD reconfiguration time, by the TCP grouping received from TCP transmit leg in base station buffering, do not forward to UE.After TDD has reshuffled, namely after TDD reconfiguration time, in step 312, the recovery unit 140 of base station recovers the forwarding of the TCP transmission suspended, and at this moment can divide into groups to the TCP of UE intransit buffering.
On the other hand, if in step 302, the comparison instruction TDD reconfiguration time of comparing unit 120 is less than predetermined threshold, then can omit step 304,306,308 and 312, and not reshuffle the special action of execution to TDD.
second example
Fig. 4 is the sequence chart according to the present invention second example.In this illustration, the UE as TCP transmit leg sends TCP transmission via base station to TCP recipient.As shown in Figure 4, in step 400, TCP transmission well afoot.Base station determines that performing TDD reshuffles.
In step 402, the acquisition unit 210 of UE obtains base station execution TDD and reshuffles the required time, t1 from base station, and determines that UE performs TDD and reshuffles the required time, t2.Then obtain unit 210 and can determine that TDD reconfiguration time is max (t1, t2).Alternatively, UE can determine TDD reconfiguration time to allow the determining unit 110 of base station by informing base station time t2, then obtains TDD reconfiguration time from base station.As described above, step 402 can perform when the initial access base station of UE.
TDD reconfiguration time and predetermined threshold can compare by the comparing unit of UE, to determine whether TDD reconfiguration time is greater than predetermined threshold.Here, comparing unit is optional, and in an alternative embodiment, UE can receive comparative result from base station.
If comparative result instruction TDD reconfiguration time is greater than predetermined threshold, then in step 404, at the layer lower than TCP layer, the transmission lag that TCP divides into groups by the delay cell of UE is according to the time period of TDD reconfiguration time.
As described above, each TCP grouping is delayed by as making before the TCP overtime timer at TCP transmit leg place expires, and TCP transmit leg (being UE itself in this situation) can receive the TCP ACK dividing into groups corresponding with the TCP postponed and divide into groups.That is, owing to postponing, TCP increases two-way time, but does not increase to and cause TCP overtime timer to expire.
Because TCP increases two-way time, the maturity value of the TCP overtime timer at TCP transmit leg place increases (step 406).Here, time of delay, section was configured to, the maturity value of the TCP overtime timer at TCP transmit leg place is increased to can not make timer because of the time-out (describing after a while) of the TCP transmission during follow-up TDD time reconf iotagurator overdue value.
Then, in step 408, the time-out unit 220 of UE suspends and sends TCP grouping to TCP recipient.In step 410, all perform TDD in base station and UE and reshuffle.At interval, namely during TDD reconfiguration time, cushion the TCP grouping that will send at the lower level of UE.After TDD has reshuffled, namely after TDD reconfiguration time, in step 412, the recovery unit 230 of UE recovers the transmission of the TCP grouping suspended, and at this moment can send the TCP grouping of buffering from UE.
On the other hand, if in step 302, comparative result instruction TDD reconfiguration time is less than predetermined threshold, then can omit step 404,406,408 and 412, and not reshuffle the special action of execution to TDD.
3rd example
Fig. 5 is the sequence chart according to the present invention the 3rd example.In this illustration, base station forwards to TCP recipient's (being the UE of base station service in this situation) TCP transmission sent from TCP transmit leg.As shown in Figure 5, in step 500, TCP transmission well afoot.Base station determines that performing TDD reshuffles.
In step 502, as described above, the determining unit 110 of base station determines that TDD reshuffles the required time.Then, the TDD reconfiguration time determined by determining unit 110 and predetermined threshold compare by the comparing unit 120 of base station.Alternatively, can perform when the initial access base station of UE and determine and compare.
If the comparison instruction TDD reconfiguration time of comparing unit 120 is greater than predetermined threshold, then in step 504, the response transmitting element of base station sends a TCP ACK to TCP transmit leg and divides into groups, to forbid that TCP transmit leg sends any more TCP groupings.Here, a TCP ACK grouping can have the receive window field of null value.As an example, response transmitting element can intercept the TCP ACK that will be forwarded to TCP transmit leg and divide into groups, and the receive window field overwrite divided into groups by intercepted TCP ACK is 0, and sends TCP ACK grouping to TCP transmit leg.
Then, in step 506, the time-out unit 130 of base station suspends and forwards TCP transmission to TCP recipient.In step 508, all perform TDD in base station and UE place and reshuffle.At interval, namely during TDD reconfiguration time, the TCP grouping that receives from TCP transmit leg in base station buffering (that is, receive to send from TCP transmit leg before a TCP ACK divides into groups and reshuffle the TCP that period arrives base station at TDD at TCP transmit leg divide into groups) and does not forward to UE.After TDD has reshuffled, namely after TDD reconfiguration time, in step 510, the response transmitting element of base station sends the 2nd TCP ACK to TCP transmit leg and divides into groups, and sends any more TCP groupings to allow TCP transmit leg.Here, the 2nd TCP ACK grouping can have the receive window field of nonzero value.The receive window field overwrite divided into groups in above-mentioned response transmitting element intercepting TCP ACK grouping and by intercepted TCP ACK is in the example of 0, and in step 510, response transmitting element can send to TCP transmit leg the TCP ACK intercepted as former state and divide into groups.
In step 512, the recovery unit 140 of base station recovers the forwarding of TCP transmission, at this moment can divide into groups to the TCP of UE intransit buffering (if any).
On the other hand, if in step 502, the comparison instruction TDD reconfiguration time of comparing unit 120 is less than predetermined threshold, then can omit step 504,506,508 and 512, and not reshuffle the special action of execution to TDD.
4th example
Fig. 6 is the sequence chart according to the present invention the 4th example.In this illustration, base station forwards the TCP transmission sent from TCP transmit leg (being the UE of base station service this situation) to TCP recipient.As shown in Figure 6, in step 600, TCP transmission well afoot.Base station determines that performing TDD reshuffles.
In step 602, as described above, the determining unit 110 of base station determines that TDD reshuffles the required time.Then, the TDD reconfiguration time determined by determining unit 110 and predetermined threshold compare by the comparing unit 120 of base station.Alternatively, can perform when the initial access base station of UE and determine and compare.
If the comparison instruction TDD reconfiguration time of comparing unit 120 is greater than predetermined threshold, then in step 604, the response transmitting element of base station sends a TCP ACK to UE and divides into groups, to forbid that UE sends any more TCP groupings.Here, a TCP ACK grouping can have the receive window field of null value.As an example, response transmitting element can intercept the TCP ACK that will be forwarded to UE and divide into groups, and the receive window field overwrite divided into groups by intercepted TCP ACK is 0, and sends TCP ACK grouping to UE.
Then, in step 606, UE is prohibited to send any more TCP groupings.In step 608, all perform TDD in base station and UE and reshuffle.After TDD has reshuffled, namely after TDD reconfiguration time, in step 610, the response transmitting element of base station sends the 2nd TCP ACK to UE and divides into groups, and sends any more TCP groupings to allow TCP transmit leg.Here, the 2nd TCP ACK grouping can have the receive window field of nonzero value.The receive window field overwrite divided into groups in above-mentioned response transmitting element intercepting TCP ACK grouping and by intercepted TCP ACK is in the example of 0, and in step 610, response transmitting element can send to UE the TCP ACK intercepted as former state and divide into groups.
In step 612, UE is allowed to send more TCP grouping.
On the other hand, if in step 602, the comparison instruction TDD reconfiguration time of comparing unit 120 is less than predetermined threshold, then can omit step 604,606,610 and 612, and not reshuffle the special action of execution to TDD.
5th example
Fig. 7 is the sequence chart according to the present invention the 5th example.In this illustration, base station forwards to TCP recipient's (being the UE of base station service in this situation) TCP transmission sent from TCP transmit leg.As shown in Figure 7, TCP transmission comprises from TCP transmit leg to first TCP transmission (TCP transmission 1) of agency with from agency to second TCP transmission (TCP transmission 2) of TCP recipient.Agency is between TCP transmit leg and base station.In step 700, TCP transmission well afoot.Base station determines that performing TDD reshuffles.
In step 702, as described above, the determining unit 110 of base station determines that TDD reshuffles the required time.Then, the TDD reconfiguration time determined by determining unit 110 and predetermined threshold compare by the comparing unit 120 of base station.Alternatively, can perform when the initial access base station of UE and determine and compare.
If the comparison instruction TDD reconfiguration time of comparing unit 120 is greater than predetermined threshold, then in step 704, the indicating member instruction agency of base station sends a TCP ACK in step 706 to TCP transmit leg and divides into groups, to forbid that TCP transmit leg sends any more TCP groupings.Here, a TCP ACK grouping can have the receive window field of null value.
Then, in step 708, the time-out unit 130 of base station suspends and forwards TCP transmission to TCP recipient.In step 710, all perform TDD in base station and UE and reshuffle.At interval, namely during TDD reconfiguration time, the TCP grouping that receives from TCP transmit leg in base station buffering (that is, receive to send from TCP transmit leg before a TCP ACK divides into groups and reshuffle the TCP that period arrives base station at TDD at TCP transmit leg divide into groups) and does not forward to UE.After TDD has reshuffled, namely after TDD reconfiguration time, in step 712, the indicating member instruction agency of base station sends the 2nd TCP ACK in step 714 to TCP transmit leg and divides into groups, and sends any more TCP groupings to allow TCP transmit leg.Here, the 2nd TCP ACK grouping can have the receive window field of nonzero value.
In step 714, the recovery unit 140 of base station recovers the forwarding of TCP transmission, at this moment can divide into groups to the TCP of UE intransit buffering (if any).
On the other hand, if in step 702, the comparison instruction TDD reconfiguration time of comparing unit 120 is less than predetermined threshold, then can omit step 704,706,708,712,714 and 716, and not reshuffle the special action of execution to TDD.
6th example
Fig. 8 is the sequence chart according to the present invention the 6th example.In this illustration, base station forwards the TCP transmission sent from TCP transmit leg (being the UE of base station service this situation) to TCP recipient.As shown in Figure 8, TCP transmission comprises from TCP transmit leg (i.e. UE) to first TCP transmission (TCP transmission 1) of agency with from agency to second TCP transmission (TCP transmission 2) of TCP recipient.Agency is between TCP recipient and base station.In step 800, TCP transmission well afoot.Base station determines that performing TDD reshuffles.
In step 802, as described above, the determining unit 110 of base station determines that TDD reshuffles the required time.Then, the TDD reconfiguration time determined by determining unit 110 and predetermined threshold compare by the comparing unit 120 of base station.Alternatively, can perform when the initial access base station of UE and determine and compare.
If the comparison instruction TDD reconfiguration time of comparing unit 120 is greater than predetermined threshold, then in step 804, the indicating member instruction agency of base station sends a TCP ACK in step 806 to TCP transmit leg and divides into groups, to forbid that UE sends any more TCP groupings.Here, a TCP ACK grouping can have the receive window field of null value.
Then, in step 808, forbid that UE sends any more TCP groupings.In step 810, all perform TDD in base station and UE place and reshuffle.After TDD has reshuffled, namely after TDD reconfiguration time, in step 812, the indicating member instruction agency of base station sends the 2nd TCP ACK in step 714 to UE and divides into groups, and sends any more TCP groupings to allow UE.Here, the 2nd TCP ACK grouping can have the receive window field of nonzero value.
In step 816, UE is allowed to send more TCP grouping.
On the other hand, if in step 802, the comparison instruction TDD reconfiguration time of comparing unit 120 is less than predetermined threshold, then can omit step 804,806,808,812,814 and 816, and not reshuffle the special action of execution to TDD.
With reference now to Fig. 9, Fig. 9, be for forwarding the flow chart of method 900 of the TCP transmission sent from TCP transmit leg to TCP recipient according to the embodiment of the present invention.Described method can perform in base station.
In step S910, determine that time division duplex (TDD) reshuffles required TDD reconfiguration time.
In step S920, TDD reconfiguration time and predetermined threshold are compared.
In step S930, if TDD reconfiguration time is greater than predetermined threshold, then during TDD reconfiguration time, suspend the TCP transmission forwarded to TCP recipient.
In step S940, after TDD reconfiguration time, recover the forwarding of the TCP transmission suspended.
Preferably, method 900 also comprises: before TDD reshuffles, by the time period of the forward delay of TCP transmission according to TDD reconfiguration time, the maturity value of the TCP overtime timer at TCP transmit leg place is increased to can not make timer because of time-out overdue value.
Preferably, method 900 also comprises: before TDD reshuffles, and sends TCP response (ACK) grouping to TCP transmit leg, to forbid that TCP transmit leg sends any more TCP groupings; And after TDD reconfiguration time, send the 2nd TCPACK grouping to TCP transmit leg, send any more TCP groupings to allow TCP transmit leg.
Preferably, a TCP ACK grouping has the receive window field of null value.
Preferably, the 2nd TCP ACK grouping has the receive window field of nonzero value.
In embodiment, TCP recipient is the subscriber equipment of base station service.
Preferably, TCP transmission comprises from TCP transmit leg to first TCP transmission of agency with from agency to second TCP transmission of TCP recipient.Described method also comprises: before TDD reshuffles, and instruction agency sends TCP response (ACK) grouping to TCP transmit leg, to forbid that TCP transmit leg sends any more TCP groupings; And after TDD reconfiguration time, instruction agency sends the 2nd TCP ACK to TCP transmit leg and divides into groups, send any more TCP groupings to allow TCP transmit leg.
In embodiment, act on behalf of between TCP transmit leg and base station.
With reference now to Figure 10, Figure 10, be for sending the flow chart of the method 1000 of TCP transmission to TCP recipient according to the embodiment of the present invention.Described method can perform at UE, and can send TCP transmission via base station to TCP recipient from UE.
In step S1010, obtain time division duplex (TDD) and reshuffle required TDD reconfiguration time.
In step S1020, if TDD reconfiguration time is greater than predetermined threshold, then suspends during TDD reconfiguration time and send TCP grouping to TCP recipient; And
In step S1030, after TDD reconfiguration time, recover the transmission of the TCP grouping suspended.
Preferably, described method also comprises: TDD reconfiguration time and predetermined threshold are compared, to determine whether TDD reconfiguration time is greater than predetermined threshold.
Preferably, described method also comprises: before TDD reshuffles, at the layer lower than TCP layer, the transmission lag that TCP is divided into groups according to the time period of TDD reconfiguration time, the maturity value of the TCP overtime timer at UE place is increased to can not make timer because of time-out overdue value.
Utilize the present invention, TCP transmission unnecessary during TDD reconfiguration time can be avoided.In addition, in the above-described embodiments, suitable mechanism is provided, to guarantee that the overtime timer at TCP transmit leg place can not expire because TDD reshuffles, thus can quick-recovery TCP transmission soon after TDD reshuffles.
Below the present invention is described with reference to the preferred embodiments of the present invention.Should be appreciated that those skilled in the art can make various amendment, change and interpolation, and do not depart from the spirit and scope of the present invention.Therefore, scope of the present invention is not limited to above specific embodiment, and by enclosing, claim defines.

Claims (23)

1., for forwarding a method for the TCP transmission sent from TCP transmit leg to transmission control protocol TCP recipient, described method comprises:
-determine that TDD reshuffles required TDD reconfiguration time;
-TDD reconfiguration time and predetermined threshold are compared;
If-TDD reconfiguration time is greater than predetermined threshold, then suspends during TDD reconfiguration time and forward TCP transmission to TCP recipient; And
-after TDD reconfiguration time, recover the forwarding of the TCP transmission suspended.
2. method according to claim 1, also comprises, before TDD reshuffles:
-by the time period of the forward delay of TCP transmission according to TDD reconfiguration time, the maturity value of the TCP overtime timer at TCP transmit leg place is increased to can not make timer because of time-out overdue value.
3. method according to claim 1, also comprises:
-before TDD reshuffles, send a TCP to TCP transmit leg and reply ACK grouping, to forbid that TCP transmit leg sends any more TCP groupings; And
-after TDD reconfiguration time, send the 2nd TCP ACK to TCP transmit leg and divide into groups, send any more TCP groupings to allow TCP transmit leg.
4. method according to claim 3, wherein, a TCP ACK grouping has the receive window field of null value.
5. method according to claim 3, wherein, the 2nd TCP ACK grouping has the receive window field of nonzero value.
6. the method according to any one of claim 1 to 5, wherein, described method is applied to base station, and TCP recipient is the subscriber equipment of described base station service.
7. method according to claim 1, wherein, TCP transmission comprises from TCP transmit leg to first TCP transmission of agency with from agency to second TCP transmission of TCP recipient, and wherein, described method also comprises:
-before TDD reshuffles, instruction agency sends a TCP to TCP transmit leg and replys ACK grouping, to forbid that TCP transmit leg sends any more TCP groupings; And
-after TDD reconfiguration time, instruction agency sends the 2nd TCPACK grouping to TCP transmit leg, sends any more TCP groupings to allow TCP transmit leg.
8. method according to claim 7, wherein, described method is applied to base station, and TCP recipient is the subscriber equipment of described base station service, and described agency is between TCP transmit leg and described base station.
9., for forwarding a base station for the TCP transmission sent from TCP transmit leg to transmission control protocol TCP recipient, described base station comprises:
-determining unit, is suitable for determining that TDD reshuffles required TDD reconfiguration time;
-comparing unit, is suitable for TDD reconfiguration time and predetermined threshold to compare;
-suspend unit, if be suitable for described comparing unit to determine that TDD reconfiguration time is greater than predetermined threshold, then suspend during TDD reconfiguration time and forward TCP transmission to TCP recipient; And
-recovery unit, is suitable for after TDD reconfiguration time, recovers the forwarding of the TCP transmission suspended.
10. base station according to claim 9, also comprises:
-delay cell, is suitable for before TDD reshuffles, by the time period of the forward delay of TCP transmission according to TDD reconfiguration time, the maturity value of the TCP overtime timer at TCP transmit leg place is increased to can not make timer because of time-out overdue value.
11. base stations according to claim 9, also comprise: response transmitting element, is suitable for:
-before TDD reshuffles, send a TCP to TCP transmit leg and reply ACK grouping, to forbid that TCP transmit leg sends any more TCP groupings; And
-after TDD reconfiguration time, send the 2nd TCP ACK to TCP transmit leg and divide into groups, send any more TCP groupings to allow TCP transmit leg.
12. base stations according to claim 11, wherein, described response transmitting element is suitable for: send a TCP ACK with the receive window field of null value to TCP transmit leg and divide into groups, to forbid that TCP transmit leg sends any more TCP groupings.
13. base stations according to claim 11, wherein, described response transmitting element is suitable for: send the 2nd TCP ACK with the receive window field of nonzero value to TCP transmit leg and divide into groups.
14. base stations according to any one of claim 9 to 13, wherein, TCP recipient is the subscriber equipment of described base station service.
15. base stations according to claim 9, wherein,
TCP transmission comprises from TCP transmit leg to first TCP transmission of agency and the second TCP transmission from described agency to TCP recipient; And
Described base station also comprises indicating member, and described indicating member is suitable for:
-before TDD reshuffles, instruction agency sends a TCP to TCP transmit leg and replys ACK grouping, to forbid that TCP transmit leg sends any more TCP groupings; And
-after TDD reconfiguration time, instruction agency sends the 2nd TCPACK grouping to TCP transmit leg, sends any more TCP groupings to allow TCP transmit leg.
16. base stations according to claim 15, wherein, TCP recipient is the subscriber equipment of described base station service, and described agency is between TCP transmit leg and described base station.
17. 1 kinds for sending the method for TCP transmission to transmission control protocol TCP recipient, described method comprises:
-obtain TDD to reshuffle required TDD reconfiguration time;
If-TDD reconfiguration time is greater than predetermined threshold, then suspends during TDD reconfiguration time and send TCP grouping to TCP recipient; And
-after TDD reconfiguration time, recover the transmission of the TCP grouping suspended.
18. methods according to claim 17, also comprise:
-TDD reconfiguration time and predetermined threshold are compared, to determine whether TDD reconfiguration time is greater than predetermined threshold.
19. methods according to claim 17, also comprise: before TDD reshuffles,
-at the layer lower than TCP layer, the transmission lag that TCP is divided into groups according to the time period of TDD reconfiguration time, the maturity value of the TCP overtime timer at UE place is increased to can not make timer because of time-out overdue value.
20. according to claim 17 to the method described in 19 any one, and wherein, described method is applied to subscriber equipment, and TCP transmission sends to TCP recipient from described subscriber equipment via base station.
21. 1 kinds for sending the subscriber equipment of TCP transmission to transmission control protocol TCP recipient, described subscriber equipment comprises:
-obtain unit, be suitable for obtaining TDD and reshuffle required TDD reconfiguration time;
-suspend unit, if be suitable for TDD reconfiguration time to be greater than predetermined threshold, then suspend during TDD reconfiguration time and send TCP grouping to TCP recipient; And
-recovery unit, is suitable for after TDD reconfiguration time, recovers the transmission of the TCP grouping suspended.
22. subscriber equipmenies according to claim 21, also comprise:
Comparing unit, is suitable for TDD reconfiguration time and predetermined threshold to compare, to determine whether TDD reconfiguration time is greater than predetermined threshold.
23. subscriber equipmenies according to claim 21, also comprise delay cell, and described delay cell is suitable for:
-before TDD reshuffles, at the layer lower than TCP layer, the transmission lag that TCP is divided into groups according to the time period of TDD reconfiguration time, the maturity value of the TCP overtime timer at UE place is increased to can not make timer because of time-out overdue value.
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